| 摘要 |
PURPOSE:To perform a stabilized control over the titled semiconductor laser by a method wherein said semiconductor laser is introduced to a plurality of optical resonators having microscopically differing optical resonant wavelengths, and the oscillation wavelength which will become the reference of the semiconductor laser is recognized from the difference in adjacent wavelength of each resonator. CONSTITUTION:The laser beam oscillated and outputted by the semiconductor laser 11 is collimated and formed into boundle of rays in parallel, and said laser beam is guided to the optical resonator 13 whereon two optical resonant paths having slightly different optical resonant wavelength. The resonant output rays passing through each optical resonant paths on the optical resonator 13 are detected by a photo detector 15, and the result is given to a time-difference detecting circuit 16. Then, the time-difference information detected by said time-difference detecting circuit 16 is outputted through the intermediary of a time-difference and voltage (T/V) converter 17. Also, the laser 11 is formed by a sweep current power source 18 that it will be swept at different oscillation wavelength by changing the amount of supplied current and the temperature, for example, and said time-difference detecting circuit 16 performs a detecting operation in synchronization with the above wavelength sweeping. |
